Method for producing a finishing layer containing a window for a portable data storage medium and said finishing layer

Abstract

A method for producing a finishing layer containing a window (104) for a portable data storage medium, in particular a chip card, and the use of the method for producing a data storage medium. A transparent plastic-based support layer (28) is used and an opaque color layer (30) is applied on the support layer in a screen printing process, wherein the color layer (30) has a recess (32) having the dimensions of the window (104). A first layer (40) of a transparent primer is then screen printed onto the color layer and a design color layer (50) is then applied in an offset printing process onto the first layer. A second layer (60) of a transparent primer is applied in an offset printing process on top of the design color layer (50) and a transparent finish (70) is finally applied onto the second layer (60).

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention relates to a method for producing a finishing layer containing a window, allowing a display element disposed beneath the finishing layer to be observed when used in a portable data storage medium. The invention further relates to a portable data storage medium having an active display element and a method for the production thereof. The invention particularly relates to a chip card having a display.[0003]2. Related Art[0004]Chip cards having displays and methods for the production thereof are known in great numbers. For example, a production method can be taken from WO 2008 / 147061 A1, according to which a board having electronic components, namely: the display, the IC with a contact pad, a battery, and a pushbutton including required wiring, is placed in a frame and potted with synthetic resin, so that a planar structure is created, the top side of which comprises the display. The synthetic resin is cured ...

AI Technical Summary

Benefits of technology

The invention describes a method for producing a finishing film using printing technology. The method involves applying a thick layer of water-based paint to a support layer, which prevents blockages between semi-finished goods. This allows for the subsequent application of thin layers of materials containing solvents without causing blockages. The resulting finishing layer is very thin, while maintaining the necessary mechanical protection of the active display element. The method is suitable for producing data storage mediums, such as chip cards, which have a smooth surface without any interruptions due to bumps or edges. Additionally, the finishing layer can be easily furnished with optical information of high quality. A data storage medium produced using this method has a clearly bordered display element.

Problems solved by technology

Obtaining good optical quality is thereby very challenging from the production engineering aspect.

A fundamental problem in the production of chip cards with displays, particularly corresponding to the requirements of the relevant ISO standard 7810, is complying with the maximum allowable thickness.

Despite the low installation height available, the display elements are sensitive to pressure and bending, and must be sufficiently protected against pressure and bending loads.

The design of the finishing layer located above the display is therefore often most difficult to design.

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